Randolph Water Hardness & Quality Report (2026)
Water Hardness
1.1 grains per gallon
Source
reservoir
pH Level
7.1
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
27.1 mg/L
Est. Daily Cost
$0.05
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Randolph, your appliances are currently losing 2% efficiency due to mineral buildup.
| Appliance | In Randolph | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 9 yrs | 8.5 yrs | — |
| Washing Machine | 12.9 yrs | 12 yrs | — |
| Water Heater | 14.9 yrs | 15 yrs | -1% |
Regional Water Comparison
How Randolph compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Randolph, Massachusetts | 18 mg/L | 4.4 ppt | 🟢 Soft | reservoir |
| Braintree, Massachusetts | 116 mg/L | 11.1 ppt | 🟡 Moderately Hard | reservoir |
| Stoughton, Massachusetts | 69 mg/L | 7.9 ppt | 🟡 Moderately Hard | reservoir |
| Brockton, Massachusetts | 63.5 mg/L | 7.5 ppt | 🟡 Moderately Hard | reservoir |
| Milton, Massachusetts | 57.5 mg/L | 7.1 ppt | 🟢 Soft | reservoir |
National Benchmark
How Randolph compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Randolph | 18 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Randolph's Water Unique?
Local geology and source profile
Randolph, Massachusetts, in Norfolk County — a major south Boston suburban community (Randolph is one of the most diverse communities in Massachusetts — a Norfolk County town with one of the highest percentages of foreign-born residents in the state; Randolph is particularly notable for its Haitian-American community (one of the largest in Massachusetts), Vietnamese-American, Cape Verdean-American, and West Indian communities — a remarkable multicultural community immediately south of Boston), a diverse Norfolk County community with a majority minority population (Randolph is one of a small number of Massachusetts towns where non-Hispanic whites are no longer the majority), adjacent to Brockton and Stoughton in the south Boston metro, and a community with a significant civic and cultural presence — draws its municipal water supply from Saquatucket–Smelt Pond watershed via the Town of Randolph Water Division. Water hardness in Randolph measures 18 mg/L — classified as very soft.
Randolph's very soft supply reflects the south Massachusetts crystalline granite watershed's calcareous-poor character. The Randolph watershed reservoirs drain the Precambrian Quincy and Dedham Granite (extremely calcareous-poor crystalline basement). Town of Randolph applies excellent softening, producing the very soft 18 mg/L.
With hardness at 18 mg/L, Randolph residents enjoy very soft water. Town of Randolph Water Division consistently delivers water meeting all Massachusetts DEP and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Saquatucket–Smelt Pond watershed via the Town of Randolph Water Division — the Norfolk County south Boston suburban Randolph corridor (Precambrian calcareous-poor Quincy Granite and Dedham Granite — the extremely calcareous-poor south Massachusetts crystalline granite watershed; Randolph excellent softening producing very soft supply); very soft supply at 18 mg/L in Norfolk County.